Merge tag 'arm-soc-imx-move' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...

[platform/kernel/linux-rpi.git] / arch / arm / mach-imx / pm-imx5.c

diff --git a/arch/arm/mach-mx5/system.c b/arch/arm/mach-imx/pm-imx5.c
similarity index 58%
rename from arch/arm/mach-mx5/system.c
rename to arch/arm/mach-imx/pm-imx5.c
index 5eebfaa..6dc0934 100644 (file)
--- a/arch/arm/mach-mx5/system.c
+++ b/arch/arm/mach-imx/pm-imx5.c
@@ -1,8 +1,6 @@
 /*
- * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
- */
-
-/*
+ *  Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
  * The code contained herein is licensed under the GNU General Public
  * License. You may obtain a copy of the GNU General Public License
  * Version 2 or later at the following locations:
@@ -10,14 +8,22 @@
  * http://www.opensource.org/licenses/gpl-license.html
  * http://www.gnu.org/copyleft/gpl.html
  */
-#include <linux/platform_device.h>
+#include <linux/suspend.h>
+#include <linux/clk.h>
 #include <linux/io.h>
-#include <mach/hardware.h>
+#include <linux/err.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
 #include <mach/common.h>
-#include "crm_regs.h"
+#include <mach/hardware.h>
+#include "crm-regs-imx5.h"
+
+static struct clk *gpc_dvfs_clk;
 
-/* set cpu low power mode before WFI instruction. This function is called
-  * mx5 because it can be used for mx50, mx51, and mx53.*/
+/*
+ * set cpu low power mode before WFI instruction. This function is called
+ * mx5 because it can be used for mx50, mx51, and mx53.
+ */
 void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
 {
        u32 plat_lpc, arm_srpgcr, ccm_clpcr;
@@ -80,3 +86,68 @@ void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
                __raw_writel(empgc1, MXC_SRPG_EMPGC1_SRPGCR);
        }
 }
+
+static int mx5_suspend_prepare(void)
+{
+       return clk_enable(gpc_dvfs_clk);
+}
+
+static int mx5_suspend_enter(suspend_state_t state)
+{
+       switch (state) {
+       case PM_SUSPEND_MEM:
+               mx5_cpu_lp_set(STOP_POWER_OFF);
+               break;
+       case PM_SUSPEND_STANDBY:
+               mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       if (state == PM_SUSPEND_MEM) {
+               local_flush_tlb_all();
+               flush_cache_all();
+
+               /*clear the EMPGC0/1 bits */
+               __raw_writel(0, MXC_SRPG_EMPGC0_SRPGCR);
+               __raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR);
+       }
+       cpu_do_idle();
+       return 0;
+}
+
+static void mx5_suspend_finish(void)
+{
+       clk_disable(gpc_dvfs_clk);
+}
+
+static int mx5_pm_valid(suspend_state_t state)
+{
+       return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
+}
+
+static const struct platform_suspend_ops mx5_suspend_ops = {
+       .valid = mx5_pm_valid,
+       .prepare = mx5_suspend_prepare,
+       .enter = mx5_suspend_enter,
+       .finish = mx5_suspend_finish,
+};
+
+static int __init mx5_pm_init(void)
+{
+       if (!cpu_is_mx51() && !cpu_is_mx53())
+               return 0;
+
+       if (gpc_dvfs_clk == NULL)
+               gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
+
+       if (!IS_ERR(gpc_dvfs_clk)) {
+               if (cpu_is_mx51())
+                       suspend_set_ops(&mx5_suspend_ops);
+       } else
+               return -EPERM;
+
+       return 0;
+}
+device_initcall(mx5_pm_init);